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COVID-19 COVID-19 (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
number
Dec. 27, 2020
USD ($)
Unusual or Infrequent Item, or Both [Line Items]    
Total Proceeds To Be Provided to U.S. Airlines From Payroll Support Program Extension   $ 15,000.0
Payroll Support Program Grant Extension    
Unusual or Infrequent Item, or Both [Line Items]    
Number of Installments Received | number 2  
Proceeds from Government Assistance, Payroll Support Program, CARES Act $ 45.9  
Total Proceeds from Payroll Support Program Grant $ 91.8  
COVID 19    
Unusual or Infrequent Item, or Both [Line Items]    
Unusual Or Infrequent Item, Reduction Of Salary 50.00%